// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}

inline int gcd(int a,int b) 
{    
	return b>0 ? gcd(b,a%b):a;
}
signed main()
{
	int n;
	cin>>n;
	vector<int> v(n);
	for(int i=0;i<n;i++)
	{
		cin>>v[i];
	}
	sort(v.begin(),v.end());
	//int ret=0;
	for(int i=1;i<n;i++)
	{
		v[0]=gcd(v[i],v[0]);
	}
	cout<<n*v[0];
	return 0;
}
